If you plan to lower your car, then get a custom made one, will cost you bigger bucks, i am paying £350 for a custom powerflow back box and center pipe.
I have one of these unversal backbox, that was made a for mk3 golf gti. Its wank as you get, and donthang right, and if i lowered it, it would smash the axel.
cant pay for quality, and you will end up paying twice like me, already spent £150 on my exhaust, only to rip it all off and start fresh!!!